Blackhat SEO poisoning topping the charts

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With the wealth of information we have published concerning blackhat search engine optimisation (SEO), hopefully the bulk of Naked Security readers are more than familiar with the perils of searching for what may be considered ‘hot’ keywords. (* For a quick background on SEO, and how it is used by malware authors, see the quick guide at the foot of this post!)

As we revealed last year, it is straightforward for the bad guys to keep up with hot, trending items, thanks to services such as Google Trends. However, it is important to remember that this is not the end of the story. SEO poisoning is not limited to just the hot or risque topics.

Back in October 2009, we wrote about how the attackers were using topics of an educational theme, designed to trap students and teachers searching for information and resources. These very same subtle tactics are still working today.

As it happens, our own product line has reached the heady heights of being SEO-worthy.

Yesterday afternoon I noticed a poisoned term which made me chuckle. Incoming data revealed a Mal/SEORed-A detection on an SEO pages constructed by one of the recent kits we have been tracking. Looking at the URL reveals the topic the user was searching for:

hxxp://[removed]/ecd.php?q=ws1000-appliance&page=7

The ‘WS1000 appliance’ search term refers to one of the Sophos web appliance (SWA) models! So a user searching for information on our web appliances was thankfully sitting behind one of them, enabling us to thwart the attack by blocking the initial redirect as Mal/SEORed-A. Were they not already a Sophos customer, they would have been subjected to the usual scareware onslaught, courtesy of a redirect to:

hxxp://[removed].cz.cc/windows-antivirus/

Irony aside, this simply reflects how effective blackhat SEO attacks actually are. This is evident from the chart below which summarises the top malware detections we have blocked on our customer web appliances (May 20th – May 25th). As you can see, blackhat SEO accounts for over 30% of all detections.

So what can users do to protect themselves? Clearly, being sensible or careful with what you search for is no use.

Users need to take care to review the links provided by the search engines, and think before they click.

Most importantly, ensure you have layered protection in place, with effective content scanning and URL filtering focused on blocking such attacks at multiple levels.

Of course, there are other tricks and tools users may use (for example, browser plug-ins that mask the HTTP referrer), but the above tips provide some simple, common sense measures to help ensure your networks are better defended against SEO driven attacks.

* Quick guide to Search Engine Optimisation

Blackhat search engine optimisation (SEO) techniques describe the process by which individuals trick the search engines into ranking one of their malicious web pages high up in the search engine result listings.

These techniques have been used aggressively by malware authors because they provide a very effective way of controlling user web traffic:

use a kit to create the keyword-rich web SEO pages on popular topics

search engine bots then index these pages

users searching for these topics end up with links to the rogue SEO pages high up in the search engine results

user clicks on one of the rogue links

the SEO kit immediately redirects the user to the malicious web site

For more details, take a look at the technical paper we published last year.

Alternatively, you can watch a YouTube video illustrating an SEO attack in action:

It's difficult for people writing about a very technical subject to get information across without confusing newbies. Not everything can be delivered in soup format, sometimes the meal has to be chewed. This article is a good starting point to gain deeper understanding of the subject. You open up a second screen and cross refer the bits you don't understand.

Heh, heh…yes, Emma, amazing that people can’t can’t be bothered to either decide this topic isn’t for them and not comment, or try and figure out what it’s talking about. I’m afraid we’re only on the small tip of the iceberg for PWMYs…

It appears to me that the article is unnecessarily convoluted.
Short version: bad people fool all-powerful megalith GOOGLE into putting nefarious web sites at top of popular trending web search results thereby increasing probability that surfers will click on said sites of evil. Once there, web site presents itself as benevolent helper, lulling surfer into false sense of security. It’s like a horror movie when you (the viewer) are yelling at the screen: DON’T OPEN THAT DOOR!
Lesson is: do NOT download anything that looks too good to be true.
If you do, then for gosh sakes, DO NOT RUN IT.
If you do run it, then you are responsible for whatever shenanigans ensue.